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cumulative percentage = (cumulative frequency ÷ n) x 100
No, cumulative is not a compound word.
Cumulative shares are when the shares are combined and then evenly distributed to the share holders. Non cumulative preference shares are when they go to certain people first.
Cumulative risks are risks that increase with each added risk.
Given a frequency table,the first cumulative frequency is the same as the first frequency;the second cumulative frequency is the sum of the first cumulative frequency and the second [ordinary] frequency;the third cumulative frequency is the sum of the second cumulative frequency and the third [ordinary] frequency;and so on.An alternative definition is that the cumulative frequency for any value is the sum of all the frequencies less than or equal to that value.